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File Edit View History Bookmarks Tools Help MasteringPhysics ch 24 Hw x C Physics For Scientists And x G Two converging lenses wit... x C Two converging Lenses w... x Q. Search https:// gphys /myct/i D-59145350 Physics for Scientists II Ch 24 HW Problem 24 Problem 24.1 Part A Two converging lenses with focal lengths of 45 cm and 20 cm Calculate the distance between the final image and 20-cm-focal-length lens. are 10 cm apart. A 2.6-cm-tall object is 20 cm in front of the Express your answer to two significant figures and include the appropriate units. 45-cm-focal-length lens. d 30 cm. Submit My Answers Give Up Incorrect; Try Again; 2 attempts remaining Part B Calculate the image height. Express your answer to two significant figures and include the appropriate units. ha' Value nits Submit My Answers Give Up Ask me anything Help l Close Resources previous l 1 of 10 l next 6:45 PM 4/21/2016

Explanation / Answer

using lens equation

1/f = 1/di + 1/do

for focal length 45 cm lens

1/di = 1/45 - 1/20

di = - 36 cm

magnification = - (-36)/20 = 1.8

now height of image or height of object for 20 cm focal length lens = 1.8*2.6 = 4.68 cm

now this image is object for 20 cm focal length lens.

now object distance from 20 cm focal length = 36 + 10 = 46 cm

1/di = 1/20 - 1/46

di = 35.38 cm [ANSWER of A]

magnification = - 35.38/46 = 0.77

height of final image = 4.68*0.77 = 3.6 cm   [ANSWER]

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